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US 6,145,488 AGranted
Reduced volume scavenging system for two cycle engines
AssigneesMPH Motors, Inc., Miles Way Coyne, PLLC
InventorRichard A. Plechner
Life of this patent
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AssigneesMPH Motors, Inc., Miles Way Coyne, PLLC
InventorRichard A. Plechner
Estimating the term…
A reduced volume scavenging system for a two cycle engine embodying a duplex cylinder having an upper cylinder bore and a reduced-diameter lower cylinder bore. The lower bore communicates with a crankcase that houses a crankshaft, connecting rod(s) and engine lubricating oil. A fixed sleeve lines the upper cylinder bore and extends up into the cylinder head. A piston disposed for reciprocating motion within the fixed sleeve has an attached cylindrical, reciprocating sleeve that extends down into the lower cylinder bore and moves with the piston. The reciprocating sleeve has compression rings that seal the lower bore and the crankcase against blowyby gases that might contaminate the oil. The fixed sleeve has an intake opening in registry with an inlet port in the upper cylinder bore for admission of fresh air-fuel mixture. The fixed sleeve also has an exhaust opening diametrically opposite the intake opening and in registry with an exhaust port in the upper cylinder bore, as well as upper and lower pairs of scavenging openings in registry with transfer passageways recessed into the upper cylinder bore, such that each out stroke of the piston forces fresh air-fuel mixture through the passageways and into the combustion chamber to flush out burnt gases. This arrangement permits use of four cycle engine lubricating methods and apparatus in two cycle engines, without unduly adding to their weight and complexity, thereby reducing the emission of air pollutants and increasing engine life.
A scavenging system for a two cycle, internal combustion engine having an engine block enclosing an engine crankcase, at least one cylinder and cylinder bore within the block, each cylinder having an upper cylinder bore in communication with, and aligned on a common axis A--A with, a lower, reduced-diameter cylinder bore, and, within the upper cylinder bore at least one inlet port, at least one exhaust port, and at least one axially-extended, transfer port passageway recessed into the upper cylinder bore for scavenging, a cylinder head mounted over the engine block at an upper end of each cylinder, a crankshaft and connecting rod assembly housed within the crankcase, a piston disposed for reciprocating motion within each upper cylinder bore and pivotally attached to a connecting rod, and four cycle engine lubrication means, comprising:
A two cycle, internal combustion engine, comprising:
A fixed sleeve for lining a duplex cylinder within a two cycle internal combustion engine, said duplex cylinder having an upper cylinder bore aligned on a common axis A--A with a lower, reduced-diameter cylinder bore and in communication therewith, the upper bore thereof having an inlet port and an exhaust port, and the inlet port being flanked on opposite sides by axially extended, transfer port passageways recessed into the upper cylinder bore for cross flow scavenging, comprising:
For use in an internal combustion engine that embodies at least one duplex cylinder having an upper cylinder bore and coaxial therewith a lower, reduced-diameter cylinder bore, and a connecting rod and crankshaft assembly housed within an engine crankcase, a combination piston and reciprocating sleeve for reciprocating motion within said upper cylinder bore, said combination comprising:
Dependencies are inferred from the claim text.